Electric switch.



GH. HART. ELECTRIC swims.

APILICATIQN HLED DEC. 3l, 1914.

LSQ'ZS; j Patented May1 1,1915

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H. HART, F WEST HARTFORD, CONNECTICUT. n" A nnncrnrc sWIrCI-I.

' To allee/10m z'zfmr/y/ concern Beit known that l, GEORGE H. HART, a citizen of. the VUnited States, residing at lVest Hartford, Hartford county, State of Connecticut," have invented certain new and useful Improvements in Electric Switches,

of which the following is a full, clear, and

exact description.`

My invention relates to improvements in electric switches 'and hastor its object to produce a new and improved snap switch which is simple in construction and easy to manufacture and can be easily made of small dimensions.

A further object of my invention is toy 1 produce a push button switch of such a character.

'largfed detail of the switcliar1n and push buttons, theA push buttons being shown in section. y y

Referring more particularly tothe draw ings, l 1s the caslng having end caps 2-2 provided with insulating bushings 8-3.

1 -4 are the two separable halves o the base.' Mounted on the two halvesof this' base are stationery contacts -5-5 each con.-`

sisting of tivo spring-.members having separable jaws the mouths of :Which are iared so as to permit theeasy entering of the switchblades. 6 is ascrevvf passing through the base portion 4s and entering the Contact 5, and 6 is a similar screw Ypassing through the'base portionl f and entering the Contact 5f. These screws 6-.6 form terminals for connecting the ends of the clrcuit Wires. lnclosed in av longitudinal opening, part of which is Vformed in eech half of the base, is a. hollow sliding'actuating member the enols of which, 7-7" constitute push buttons. portion of this member is provided with a. slot S and mounted in this slot is the lower Specification of Letters atent.

A central- Patented May 11,1915.

. Y Y I Application filed' December 31, 1.914. Serial No. 879,821. v

enel of a: switch-arm 9 having; two peaked cam surfaces'l0-40.

ll' is a pivot passing through the lower enti of the switch-arm, and through the actuating member so as to connectthe switcharm to the actuating member 'in such a man# ner that it has a movement of oscillation relatively thereto about the pivot 1l.

12--12 are balls inclosed in the ends of the actuating member and 13-13 .are springs tending to force those balls toward the center and` causing them to engage with the cam surfaces 10-,-l0.

1&14' are switch-blades forming a {mrt-of the switch-arm l) :nul electrically connected together but insulated from the .main por- .tion of the switch-arm, by insulating washers 15. The main portion of the switch-arm vprovided with bearingl surfaces 1(3-16 which extend beyond the front and rear f aces of 'the switch-blades 14f-1l1 and constitute shoes for engaging bearing surfaces 17-l7" carried by the respective halves ofthe base(y The operation ot' the switch is -as follows: lV hen the parts are inthe position shown in l1`ig.`2 pressure upon the push button 47 'causes the actuatingmeinberfto iiiove to the left carrying the pivot 11. Thel shoe 16 bearing against the surfacel? prevents the upper end of the switch-arm from moving to the left and therefore causes the cam surface 410--10 to move until their peaks pass .the balls lQ-flQ, whereupon the springs 13K-13' throw the balls toward the center and cause the switch-arm to move with a snap-action towarilthe right into engagement with the stationary contacts, 5 5 forming an electrical ,connection between them. When the switch is in closed position, pressure uponthe push button 7 causes the actuating member A to move to the right, whereupon the shoe 16 engaging the surface 17 prevents the upper' end of the',

" to oseiilate tothe left relatively to the ae- I tuating member and Withdraw from the contact members 5w-5 opening the circuit;

l preferably use two cam surfaces 10,-10v

yand two balls 12-12 and springs 13, 13.

in which :use the actions 'o the springs 43l3--18 supplement eachother and furthermore produce a somewhat balanced pressure against the lower endof the basesare provided with lateral extensions 18---18A the ends of vwhich are separatedfso as to permit the passage of the- *shank of the switch-arm 9. They serve to separate to considerable extent the engaging portions of-the contacts 5 inclose those portions in a small inclosure.

v'l`he\ casing l is provided with slots 1 9-19l into which the push buttons 7--7 enter as the assembled. base and actuating parts are inserted in the casing. The casing is also provided with an insulating lining 20, While the caps are provided with insulating lin- The base portions 4-4 are counterparts of one another, the rpassages 222-22', being le'lt :1t-.each end of the dividing portions lS-IS so as to receive the upwardly vextending portions "of the contacts .VP-5f, one of these passages oneach half of the base being occupied by such' upwardly extending portion while the other is empty.

'ing .its upper end toniove relatively 5K5 I preferably make two since by reason of them the two halves of these passages but one set of molds and the unoccupied portions do not 'e'iiect the operation of the switch. The tivo halves of the base are held together by screws passing through the holes 22S-23C The push buttons are pro- .vided with shoulders 2dr-2st which 'engage portions of .the base, as shown in Fig..2,

pressed body 'carried b v said member and4 engaging said cam, said base having a sur. ace located on the opposite si'de of .sazidi;

sivitchfarm from said stationary contacts and engaged by said su'itch-arm' and cans' to said member in the direction of said contacts when said member is moved in the vopposite; direction. rA

2. In an electric vswitch the combination of a base, stationary contacts thereon,. an actuating member having a to and fro movement and carried by said base, an oseillat-I ing .sWitch-armpivoted to said. actuating member and having a peaked cam, a spriiigswitch-arm and reduce the strain upon the'pivot 11. The.

'5' and the switch-blades 14e-14 from the actuating mechanism and of the base are exact counterparts requiring i pressedbody carried by said member and engaging said cam, saidy base having a sur-y face located, on the opposite side ofsaidA switch-.ann from 'said .stationary contacts and engaged by said switch-arm and caus-v ing its' upper end to move relatively to said member in when said member Iis moved iny lthe opposite; direction,. said switch-arm rconsisting offa main portion and blades insulated there-` drom, said main portion having an extension which engages said surface on said besef 3. In an electric switch the combinationy .of a base, stationary contacts, thereon, an

mentand carried bysaid base, -an oscilla-t',

ing switch-arm pivoted` to said actuating member and having a -peaked cam, a spring-` vpressed body carried by said member and engaging said cam, and said basediavingy two surfaces on opposite Asides of said switch-arm and engaged by said switch-armso as to make its upper endfmove relatively to said member in a direction opposite to `the movement of said member when` said member is moved.

4. In' an electric switch the combination of' a base,stationaryl contacts thereon, an actuating member having a-to and fro move-- nient and carried by said base, an oscillatf..

ingA vswitch-arm pivoted to said actuating inei'nber and Ahaving a peaked cam, a spring- '.engagingsaid cam', and' two surfaces 'on opposite` sides ,of said switch-arm and engaged by said switch-arm' so as to make its .upperiendtmove relatively` to 'd ineinber in a direction opposite to the movement of sa-id"meniber when said member is moved, saidiswitch-arm consisting of a inainportion and switch-blades in# the parts thereof which said surfacebeing-oppositel-y ex-Yr sulated therefrom, engage. tbnding'portioiis of said ii'iain' portion.

. In-an. electric switch, theeonibination 'of a basepstationary contactstheieon, any? actuating member having a to l'and fro move-f' nient carried by said base, anjoscillating suitchfariu,pivoted.to said'meniberand havi ivo oppositely-extending 'peaked camsv adjacent to. the pivot, tivospring-pressed-` bodies longitudinally movable vwithin 4said actuating iiieiiiber and engaging said cams respectively, and means for preventing ,the

upper en d of said switch-arm' from followingili movements of saidactuating memberVv )until --ltlie peaks y'o'lisaid cainsdmvev passed y said spring-pressed bodies.v

'IVitnessesr I p SUM-NER I". FULLER, 'Hanni' A. HART;

the direction of said contactsl actuating member having a to and fro move-.

GEORGE HART. f.

.pressed body carried vby said .member and? said-base hai-'inw ice 

